package com.singzi;

public class People {
    String name;
    public People(){
        System.out.print(1);
    }
    public People(String name){
        System.out.print(2);
        this.name = name;
    }
}
class Child extends People{
    People father;
    public Child(String name){
        System.out.print(3);
        this.name = name;
        father = new People(name + "F");
    }
    public Child(){
        System.out.print(4);
    }
}